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CVE-2026-92509— RDMA/core: Fix potential use after free in counter_release()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： RDMA/core：修复 中潜在的释放后使用（use-after-free）问题 当通过 netlink 路径访问计数器时，针对该计数器唯一的同步机制是 。 目前， 在 的末尾被调用，这为时过晚，因为此时与该计数器关联的厂商特定资源可能已经释放。这可能导致一个短暂的时间窗口，在此期间，该计数器仍可通过 restrack 访问，从而引发潜在的释放后使用（use-after-free）问题。 修复方法是：将 的调用移至释放厂商特定资源之前，确保在释放其内部资源之前，该计数器已从

AI Predicted 7.8 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 99fa331dc8629be55ac7a0cca0dc56492070ddac< 5eb0c57a8b568eb08f464861d84d518a2af939ac affected
99fa331dc8629be55ac7a0cca0dc56492070ddac< d5cc211e8c39e46f357d30a092d683e84d560de9 affected
99fa331dc8629be55ac7a0cca0dc56492070ddac< 2f0c6705e26ba92c0c6b0b0908a2d3f35a039d5b affected
99fa331dc8629be55ac7a0cca0dc56492070ddac< 8c013e3a8d8273da4d47bf1c27f016a3551996f5 affected
99fa331dc8629be55ac7a0cca0dc56492070ddac< 64c72390d8407ea86de712a477c796b07d37abc4 affected
99fa331dc8629be55ac7a0cca0dc56492070ddac< 235ef2d0e750885c29340b0fc40620a7a4f52e12 affected
5.3 affected
< 5.3 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-92509

Vulnerability Information
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Vulnerability Title
RDMA/core: Fix potential use after free in counter_release()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix potential use after free in counter_release() When accessing a counter via the netlink path the only synchronization mechanism for the said counter is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of counter_release(), which is too late, since by that point vendor-specific resources associated with the counter might already be freed. This can leave a short window where the counter remains accessible through restrack, leading to a potential use-after-free. Fix this by moving the rdma_restrack_del() call to be before the freeing of the vendor-specific resources, ensuring that the counter is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a counter that is in the process of destruction.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 99fa331dc8629be55ac7a0cca0dc56492070ddac ~ 5eb0c57a8b568eb08f464861d84d518a2af939ac -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-92509

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III. Intelligence Information for CVE-2026-92509

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Patches & Fixes for CVE-2026-92509 (6)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-92509

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